A girl delivering newspapers travels 4 blocks west, 5 blocks north, then 6 blocks east. what is the magnitude of her resultant displacement? answe

How many electrons should be in an atom's valence shell (with the exception of hydrogen and helium) to become stable?

How is elastic energy related to mechanical energy?

You need to lift up a 45-N object. Explain the strength and direction of the force used to lift the object.

If a chemical change has taken place, which of these is most likely true?

Why can certain stars sometimes be identified as eclipsing binary stars?

The spacing and distribution of individuals within a population is known as

A biker going around a circular track at constant speed is accelerating. Why? A. Direction is constantly changing B. Gravity is pulling on it C. The speed us changing D. The earth is rotating

A ball is thrown from the top of one building toward a tall building 50 m away. The initial velocity of the ball is 20 m/s at 40° above the horizontal. How far above or below its original level will the ball strike the opposite wall?

Jamal wanted only to test the effect of the free fall and so he put his system in a vacuum to prevent air resistance. In free fall, will the crumpled or flat paper reach the ground first? The crumpled paper will reach the ground first.

Earth is subject not only to the gravitational force of the Moon but also to the gravitational pull of the Sun. However, Earth is much farther away from the Sun than it is from the Moon. In fact, the center of Earth is at an average distance of 1.